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diff --git a/extern/audaspace/include/fx/HRTF.h b/extern/audaspace/include/fx/HRTF.h
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+++ b/extern/audaspace/include/fx/HRTF.h
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+/*******************************************************************************
+* Copyright 2015-2016 Juan Francisco Crespo Galán
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*   http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+******************************************************************************/
+
+#pragma once
+
+/**
+* @file HRTF.h
+* @ingroup fx
+* The HRTF class.
+*/
+
+#include "util/StreamBuffer.h"
+#include "util/FFTPlan.h"
+#include "ImpulseResponse.h"
+
+#include <memory>
+#include <vector>
+#include <unordered_map>
+#include <utility>
+
+AUD_NAMESPACE_BEGIN
+
+/**
+* This class represents a complete set of HRTFs.
+*/
+class AUD_API HRTF
+{
+private:
+	/**
+	* An unordered map of unordered maps containing the ImpulseResponse objects of the HRTFs.
+	*/
+	std::unordered_map<float, std::unordered_map<float, std::shared_ptr<ImpulseResponse>>> m_hrtfs;
+
+	/**
+	* The FFTPlan used to create the ImpulseResponses.
+	*/
+	std::shared_ptr<FFTPlan> m_plan;
+
+	/**
+	* The specifications of the HRTFs.
+	*/
+	Specs m_specs;
+
+	/**
+	* True if the HRTF object is empty.
+	*/
+	bool m_empty;
+
+	// delete copy constructor and operator=
+	HRTF(const HRTF&) = delete;
+	HRTF& operator=(const HRTF&) = delete;
+
+public:
+	/**
+	* Creates a new empty HRTF object that will instance it own FFTPlan with default size.
+	*/
+	HRTF();
+
+	/**
+	* Creates a new empty HRTF object.
+	* \param plan A shared pointer to a FFT plan used to transform the impulse responses added.
+	*/
+	HRTF(std::shared_ptr<FFTPlan> plan);
+
+	/**
+	* Adds a new HRTF to the class.
+	* \param impulseResponse A shared pointer to an StreamBuffer with the HRTF.
+	* \param azimuth The azimuth angle of the HRTF. Interval [0,360).
+	* \param elevation The elevation angle of the HRTF.
+	* \return True if the impulse response was added successfully, false otherwise (the specs weren't correct).
+	*/
+	bool addImpulseResponse(std::shared_ptr<StreamBuffer> impulseResponse, float azimuth, float elevation);
+
+	/**
+	* Retrieves a pair of HRTFs for a certain azimuth and elevation. If no exact match is found, the closest ones will be chosen (the elevation has priority over the azimuth).
+	* \param[in,out] azimuth The desired azimuth angle. If no exact match is found, the value of azimuth will represent the actual azimuth elevation of the chosen HRTF. Interval [0,360)
+	* \param[in,out] elevation The desired elevation angle. If no exact match is found, the value of elevation will represent the actual elevation angle of the chosen HRTF.
+	* \return A pair of shared pointers to ImpulseResponse objects containing the HRTFs for the left (first element) and right (second element) ears.
+	*/
+	std::pair<std::shared_ptr<ImpulseResponse>, std::shared_ptr<ImpulseResponse>> getImpulseResponse(float &azimuth, float &elevation);
+
+	/**
+	* Retrieves the specs shared by all the HRTFs.
+	* \return The shared specs of all the HRTFs.
+	*/
+	Specs getSpecs();
+
+	/**
+	* Retrieves the state of the HRTF object.
+	* \return True if it is empty, false otherwise.
+	*/
+	bool isEmpty();
+};
+
+AUD_NAMESPACE_END